Agilent Technologies ESA-E Series User And Programming Manual page 62

Making Modulation Analysis Measurements
Interpreting Measurement Results
3. The zoomed phase error graph is shown in
number of cycles can be accurately determined, the phase
modulating signal frequency can be calculated. Use the
Amplitude
determination. It may also be helpful to pause the trace using the
Meas Control
PM
In this example, Phase Error freq. = 3 cycles, number of symbols =
256, and symbol rate is 3.84 x 10
PM
4. Peak deviation of the phase modulating signal is easily determined
from
modulation at 1 degree per division. This approximates the actual
5.5° of phase modulation applied to create this signal.
Figure 4-28 Zoomed Phase Error Display Showing PM Interference
48
keys to adjust the scaling, if necessary, to make this
key.
= Phase Error freq. / number of symbols x symbol rate
f
6
= 3/256 x 3.84 x 10
f
Figure 4-28. There are about 5 divisions of peak phase
Figure
6
, or 45 kHz
4-28. If the
and
Span
Chapter 4